Optimize strlen calls and fix code quality issues

[Copilot]

Identified and fixed performance bottlenecks from redundant string operations and corrected static analysis violations.

Performance Improvements

• Eliminated redundant strlen() in handle_short_flag(): Check argv[arg_idx][2] != '\0' directly instead of computing string length
• Optimized handle_long_flag(): Use strchr() for equals sign detection, cache argument length
• Simplified carg_print_args(): Replace runtime format string manipulation with direct printf() calls

Before:

char format_pattern[] = "pos_%d : %0 \n";
format_pattern[10] = 'd';  // Runtime manipulation
printf(format_pattern, pos_idx, value);

After:

printf("pos_%d : ", pos_idx);
printf("%d \n", value);

Code Quality Fixes

• Header guard: __C_ARGPARSE_H__ → C_ARGPARSE_H_ (reserved identifier)
• Macro to const: #define BASE_10 → static const int BASE_10
• Uninitialized variable: Initialize detected_type on all code paths in identify_arg_type()

Net result: -22 lines, faster parsing, cleaner code.

Original prompt

Identify and suggest improvements to slow or inefficient code

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