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## searchreplace
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### Instructions
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Write a program that takes 3 arguments, the first arguments is a string in which to replace a letter (2nd argument) by another one (3rd argument).
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- If the number of arguments is not 3, just display a newline.
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- If the second argument is not contained in the first one (the string) then the program simply rewrites the string followed by a newline.
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### Expected output
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```console
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student@ubuntu:~/piscine/test$ go build
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student@ubuntu:~/piscine/test$ ./test "hella there" "a" "o"
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hello there
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student@ubuntu:~/piscine/test$ ./test "abcd" "z" "l"
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abcd
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student@ubuntu:~/piscine/test$ ./test "something" "a" "o" "b" "c"
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student@ubuntu:~/piscine/test$
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```
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