pattern_generator/
lib.rs

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pub fn generate_pattern(input: &str) -> String {
    let mut result = String::new();

    if let Some((text, symbol)) = input.split_once('-') {
        let symbol = symbol.trim().to_string(); // Convert to owned String
        let text = text.trim().to_uppercase();

        // Create a grid for the text
        let cols = text.len() * 6 + 1;
        let mut grid = vec![vec![String::from(" "); cols]; 6]; // Use String instead of &str

        // Position in the grid
        let mut col = 0;

        for ch in text.chars() {
            draw_character(&mut grid, ch, &symbol, col);
            col += 6;
        }

        // Convert grid to string
        for row in 0..6 {
            for col in 0..cols {
                result.push_str(&grid[row][col]);
            }
            result.push('\n');
        }
    } else {
        result.push_str("Invalid input format. Use 'Text - *'.\n");
    }

    result
}

fn draw_character(grid: &mut Vec<Vec<String>>, ch: char, symbol: &str, col: usize) {
    match ch {
        'A' => {
            for row in 0..6 {
                grid[row][col] = symbol.to_string();
                grid[row][col + 4] = symbol.to_string();
                if row == 0 || row == 2 {
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 2] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                }
            }
        }
        'B' => {
            for row in 0..6 {
                grid[row][col] = symbol.to_string();
                if row == 0 || row == 2 || row == 5 {
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 2] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                }
                grid[row][col + 4] = symbol.to_string();
            }
        }
        'C' => {
            for row in 0..6 {
                grid[row][col] = symbol.to_string();
                if row == 0 || row == 5 {
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 2] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                }
            }
        }
        'D' => {
            for row in 0..6 {
                grid[row][col] = symbol.to_string();
                if row == 0 || row == 5 {
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 2] = symbol.to_string();
                }
                grid[row][col + 3] = symbol.to_string();
            }
        }
        'E' => {
            for row in 0..6 {
                grid[row][col] = symbol.to_string();
                if row == 0 || row == 2 || row == 5 {
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 2] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                }
            }
        }
        'F' => {
            for row in 0..6 {
                grid[row][col] = symbol.to_string();
                if row == 0 || row == 2 {
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 2] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                }
            }
        }
        'G' => {
            for row in 0..6 {
                grid[row][col] = symbol.to_string();
                if row == 0 || row == 5 {
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 2] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                }
                if row >= 2 {
                    grid[row][col + 3] = symbol.to_string();
                }
            }
        }
        'H' => {
            for row in 0..6 {
                grid[row][col] = symbol.to_string();
                grid[row][col + 4] = symbol.to_string();
                if row == 2 {
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 2] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                }
            }
        }
        'I' => {
            for row in 0..6 {
                grid[row][col + 2] = symbol.to_string();
                if row == 0 || row == 5 {
                    grid[row][col] = symbol.to_string();
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                    grid[row][col + 4] = symbol.to_string();
                }
            }
        }
        'J' => {
            for row in 0..6 {
                grid[row][col + 3] = symbol.to_string();
                if row == 5 {
                    grid[row][col] = symbol.to_string();
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 2] = symbol.to_string();
                }
                if row == 0 {
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 2] = symbol.to_string();
                }
            }
        }
        'K' => {
            for row in 0..6 {
                grid[row][col] = symbol.to_string();
                if row < 3 {
                    grid[row][col + 4 - row] = symbol.to_string();
                } else {
                    grid[row][col + row - 1] = symbol.to_string();
                }
            }
        }
        'L' => {
            for row in 0..6 {
                grid[row][col] = symbol.to_string();
                if row == 5 {
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 2] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                }
            }
        }
        'M' => {
            for row in 0..6 {
                grid[row][col] = symbol.to_string();
                grid[row][col + 4] = symbol.to_string();
                if row == 1 {
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                }
                if row == 2 {
                    grid[row][col + 2] = symbol.to_string();
                }
            }
        }
        'N' => {
            for row in 0..6 {
                grid[row][col] = symbol.to_string();
                grid[row][col + 4] = symbol.to_string();
                grid[row][col + row] = symbol.to_string();
            }
        }
        'O' => {
            for row in 0..6 {
                grid[row][col] = symbol.to_string();
                grid[row][col + 4] = symbol.to_string();
                if row == 0 || row == 5 {
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 2] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                }
            }
        }
        'P' => {
            for row in 0..6 {
                grid[row][col] = symbol.to_string();
                if row <= 2 {
                    grid[row][col + 4] = symbol.to_string();
                }
                if row == 0 || row == 2 {
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 2] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                }
            }
        }
        'Q' => {
            for row in 0..6 {
                if row < 4 {
                    grid[row][col] = symbol.to_string();
                    grid[row][col + 4] = symbol.to_string();
                }
                if row == 0 || row == 3 {
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 2] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                }
                if row >= 3 {
                    grid[row][col + row - 2] = symbol.to_string();
                }
            }
        }
        'R' => {
            for row in 0..6 {
                grid[row][col] = symbol.to_string();
                if row <= 2 {
                    grid[row][col + 4] = symbol.to_string();
                }
                if row == 0 || row == 2 {
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 2] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                }
                if row >= 3 {
                    grid[row][col + row - 1] = symbol.to_string();
                }
            }
        }
        'S' => {
            for row in 0..6 {
                if row == 0 || row == 2 || row == 5 {
                    grid[row][col] = symbol.to_string();
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 2] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                }
                if row < 2 {
                    grid[row][col] = symbol.to_string();
                }
                if row > 2 && row < 5 {
                    grid[row][col + 3] = symbol.to_string();
                }
            }
        }
        'T' => {
            for row in 0..6 {
                grid[row][col + 2] = symbol.to_string();
                if row == 0 {
                    grid[row][col] = symbol.to_string();
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                    grid[row][col + 4] = symbol.to_string();
                }
            }
        }
        'U' => {
            for row in 0..6 {
                grid[row][col] = symbol.to_string();
                grid[row][col + 4] = symbol.to_string();
                if row == 5 {
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 2] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                }
            }
        }
        'V' => {
            for row in 0..6 {
                if row < 4 {
                    grid[row][col] = symbol.to_string();
                    grid[row][col + 4] = symbol.to_string();
                } else {
                    grid[row][col + (row - 3)] = symbol.to_string();
                    grid[row][col + 4 - (row - 3)] = symbol.to_string();
                }
            }
        }
        'W' => {
            for row in 0..6 {
                grid[row][col] = symbol.to_string();
                grid[row][col + 4] = symbol.to_string();
                if row >= 3 {
                    grid[row][col + 2] = symbol.to_string();
                }
                if row == 4 {
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                }
            }
        }
        'X' => {
            for row in 0..6 {
                grid[row][col + row] = symbol.to_string();
                grid[row][col + 4 - row] = symbol.to_string();
            }
        }
        'Y' => {
            for row in 0..6 {
                if row < 3 {
                    grid[row][col + row] = symbol.to_string();
                    grid[row][col + 4 - row] = symbol.to_string();
                } else {
                    grid[row][col + 2] = symbol.to_string();
                }
            }
        }
        'Z' => {
            for row in 0..6 {
                if row == 0 || row == 5 {
                    grid[row][col] = symbol.to_string();
                    grid[row][col + 1] = symbol.to_string();
                    grid[row][col + 2] = symbol.to_string();
                    grid[row][col + 3] = symbol.to_string();
                    grid[row][col + 4] = symbol.to_string();
                } else {
                    grid[row][col + 4 - row] = symbol.to_string();
                }
            }
        }
        _ => {}
    }
}

// Add tests
#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_basic_pattern() {
        let result = generate_pattern("HI - *");
        assert!(result.contains('*'));
    }

    #[test]
    fn test_invalid_input() {
        let result = generate_pattern("invalid");
        assert!(result.contains("Invalid input format"));
    }
}