Replace all spaces in a string with '%20'

Replace all spaces in a string with '%20'

Problem: Write a C program that will replace all spaces with '%20′

Solution:
The algorithm is as follows:
1. Count the number of spaces during the first scan of the string.
2. Parse the string again from the end and for each character:

If a space is encountered, store "%20".
Else, store the character as it is in the newly shifted location.

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