Dataframe reshaping based on column count

I have a 2 column 100,000 row dataframe that looks as follows:

Count               String
3                 "Hello World"
2                  "Hi John"
1                  "Dear Joe"

I want to reshape this dataframe into a 1 column dataframe, removing the count and instead adding the repeating items. E.g.,

"Hello World"
"Hello World"
"Hello World"
"Hi John"
"Hi John"
"Dear Joe"



one_col_df <- data.frame(String = rep(df$String, df$Count))

What is going on there is that for each String, the function rep will repeat Count times, respecting their order in vector.

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