How can the original string be transformed or modified?

In Go, you can use standard functions from the strings package and methods of the string type for transforming or modifying strings.

Examples:

• Case conversion:

import "strings"

s := "Hello, World!"
lower := strings.ToLower(s) // "hello, world!"
upper := strings.ToUpper(s) // "HELLO, WORLD!"

• Substring replacement:

replaced := strings.ReplaceAll(s, "World", "Go") // "Hello, Go!"

• Trimming spaces:

trimmed := strings.TrimSpace("  text  ") // "text"

• Splitting a string:

parts := strings.Split(s, ",") // ["Hello" " World!"]

For more complex modifications, you can use strings.Builder for efficient construction of new strings.