Extending current work for linear c functions

[larryshamalama]

Closes bullet point 2 of #1.

This PR is missing two elements, albeit they are not urgent:

• [x] Unit tests for #22 and this new feature
• [ ] Simplification of sf function to "`singledispatch'' akin in Python

[larryshamalama]

Single dispatching of sf can be done in a separate PR. Tip: use R's S3 method which is similar to Python's singledispatching:

# Define the generic function
my_function <- function(x, ...) {
  UseMethod("my_function")
}

# Define the method for numeric vectors
my_function.numeric <- function(x, ...) {
  sum(x)
}

# Define the method for character vectors
my_function.character <- function(x, ...) {
  paste(x, collapse = " ")
}

# Test the function with a numeric vector
print(my_function(c(1, 2, 3)))  # Prints 6

# Test the function with a character vector
print(my_function(c("Hello", "world!")))  # Prints "Hello world!"