Collapse string of arguments and join them by '+'
     
    
    
    Arguments
    - str_vector
- a vector of strings to be collapsed 
 
    
    Value
    
A string with the input parameters combined as a string, separated by '+'
     
    
    Examples
    str_collapse("my name")
#> [1] "my name"
str_collapse(c("my name", "is", "jake"))
#> [1] "my name + is + jake"
str_collapse(c("my name", "is", 2))
#> [1] "my name + is + 2"
str_collapse(c(3, 2, "boy"))
#> [1] "3 + 2 + boy"