inrust 0.3.7

Accumulate knowledge of my study on Rust language
Documentation 
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# adjust default configurations to preferred by mhfan: https://rust-lang.github.io/rustfmt
# rustfmt --print-config default    # rustfmt --print-config current rustfmt.toml

unstable_features = true
edition = "2021"
version = "Two"
binop_separator = "Back"
brace_style = "PreferSameLine"
condense_wildcard_suffixes  = true
format_code_in_doc_comments = true
format_macro_matchers = true
format_strings = true
fn_single_line = true
imports_indent = "Visual"
indent_style   = "Visual"
match_arm_blocks  = false
where_single_line = true
overflow_delimited_expr  = true
use_field_init_shorthand = true
imports_granularity = "Module"
group_imports = "StdExternalCrate"
short_array_element_width_threshold = 20
inline_attribute_width = 50