Question: df.h main.cpp df.h ( begin{array}{l} 1 text { #ifndef DF_H } 2 text { #define DF_H } 3 4 text { //



df.h main.cpp df.h \( \begin{array}{l} 1 \text { \#ifndef DF_H } \\ 2 \text { \#define DF_H } \\ 3 \\ 4 \text { // Write your prototype here } \\ 5 \text { void cap(std::string \&s); } \\ 6 \\ 7 \text { \#endif } \\ \text { in.cpp } \\ 1 \text { \#include "df.h" } \\ 2 \text { \#include
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