exchange two characters in a string
Exchange( s, m, n )
The Exchange( s, m, n ) command exchanges characters m and n in the string s. The integers m and n must satisfy 1≤m,n≤length⁡s.
All of the StringTools package commands treat strings as (null-terminated) sequences of 8-bit (ASCII) characters. Thus, there is no support for multibyte character encodings, such as unicode encodings.
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