{
"test_cases": [
{
"name": "simple_lowercase",
"input": "Alice",
"expected": "alice"
},
{
"name": "trim_whitespace",
"input": " bob ",
"expected": "bob"
},
{
"name": "collapse_spaces",
"input": "John Smith",
"expected": "john smith"
},
{
"name": "strip_at_prefix",
"input": "@username",
"expected": "username"
},
{
"name": "strip_hash_prefix",
"input": "#channel",
"expected": "channel"
},
{
"name": "mixed_case_and_spaces",
"input": " @MyUserName ",
"expected": "myusername"
},
{
"name": "email_preserved",
"input": "User@Example.COM",
"expected": "user@example.com"
},
{
"name": "empty_input",
"input": "",
"expected": ""
},
{
"name": "whitespace_only",
"input": " ",
"expected": ""
},
{
"name": "unicode_preserved",
"input": "Ronaldo Lima",
"expected": "ronaldo lima"
}
]
}