How should I practice Replace Characters in a Mutable String?

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Replace Characters in a Mutable String

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Problem statement

Replace every occurrence of the one-character string from in text with the one-character string to. Return the result.

Function

replaceCharacter(text: String, sourceCharacter: String, targetCharacter: String) → String

Examples

Example 1

text = "banana"sourceCharacter = "a"targetCharacter = "o"return = "bonono"

All three a characters become o.

Constraints

0 <= text.length <= 10^6.
from.length == to.length == 1.