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Quick Summary

Locate every non-overlapping instance of a target substring inside a source string.
Substitute each matched segment with a replacement string.
Implement the replacement logic manually without using built-in string methods.

What This Tests

Efficient string pattern matching techniques
Linear traversal and boundary condition handling
Result construction without intermediate slicing
Algorithmic complexity trade-offs

Common Patterns

Two Pointers

String Matching

Test Cases

Input

Output

Expected