refactor: remove zero_var

Author: AayushSabharwal

src/systems/problem_utils.jl

@@ -247,25 +247,6 @@ function recursive_unwrap(x::AbstractDict)
     return anydict(unwrap(k) => recursive_unwrap(v) for (k, v) in x)
 end
 
-"""
-    $(TYPEDSIGNATURES)
-
-Return the appropriate zero value for a symbolic variable representing a number or array of
-numbers. Sized array symbolics return a zero-filled array of matching size. Unsized array
-symbolics return an empty array of the appropriate `eltype`.
-"""
-function zero_var(x::Symbolic{T}) where {V <: Number, T <: Union{V, AbstractArray{V}}}
-    if Symbolics.isarraysymbolic(x)
-        if is_sized_array_symbolic(x)
-            return zeros(eltype(T), size(x))
-        else
-            return T[]
-        end
-    else
-        return zero(T)
-    end
-end
-
 """
     $(TYPEDSIGNATURES)