changeCharacter method

String changeCharacter(
  1. int? no,
  2. String? character
)

Implementation

String changeCharacter(int? no, String? character) {
  if (no == null || character == null || this == null) return this!;
  if (no >= this!.length) return this!;
  return this!.substring(0, no) + character + this!.substring(no + 1);
}